Here are some cheats and tips for the game Death Jr..
All weapon upgrades:
Press Start to pause game play, then hold L and press Up(2), Down(2),
Left, Right, Left, Right, X, Circle.
Level select:
Press Start to pause game play, then hold L and press Up(4), Down(4),
X(2).
Advanced Training level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Down, X, Down, Square.
Basic Training level:
Press Start to pause game play, then hold L and press Up, Triangle,
Up, X, Down, X, Down, X, Down, X.
Big Trouble in Little Downtown level:
Press Start to pause game play, then hold L and press Up, Triangle,
Down, X, Down, X, Down, X, Down, X.
Bottom of the Bell Curve level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Down, X, Down, Triangle.
Burn it Down level:
Press Start to pause game play, then hold L and press Down, X, Up,
Triangle, Down, X, Down, X, Down, X.
Final Battle level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Down, Triangle, Up, X.
Growth Spurt level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Down, X, Up, X.
Happy Trails Insanitarium level:
Press Start to pause game play, then hold L and press Down, X, Down,
Triangle, Up, X, Down, X, Down, X.
Higher Learning level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Down, Triangle, Down, X.
How a Cow Becomes a Steak level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, Triangle, Down, X, Down, X.
Inner Madness Level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Up, Triangle, Down, X, Down, X.
Into the Box level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Up, Triangle, Down, X.
Moving on Up level:
Press Start to pause game play, then hold L and press Down, Triangle,
Up, X, Down, X, Down, X, Down, X.
My House level:
Press Start to pause game play, then hold L and press Down, X, Down,
Triangle, Down, X, Down, X, Down, X.
Seep’s Hood level:
Press Start to pause game play, then hold L and press Down, Triangle,
Down, X, Down, X, Down, X, Down, X.
Shock Treatment level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, Triangle, Up, X, Down, X.
The Basement:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Down, X, Up, Triangle.
The Burger Tram level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Up, X, Down, X.
The Corner Store level:
Press Start to pause game play, then hold L and press Down, X, Up,
X, Down, X, Down, X, Down, X.
The Museum level:
Press Start to pause game play, then hold L and press Up, X, Down X,
Down, X, Down, X Down, X.
Udder Madness level:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Up, X, Down, X, Down, X.
Refill ammunition:
Press Start to pause game play, then hold L and press Triangle(2),
X(2), Square, Circle, Square, Circle, Down, Right.
Unlimited ammunition:
Press Start to pause game play, then hold L and press Triangle(2),
X(2), Square, Circle, Square, Circle, Right, Down.
Invincibility:
Press Start to pause game play, then hold L and press Up(2), Down(2),
Left(2), Right(2), Square, Triangle. When you exit the start menu,
“Can’t touch this” will appear to confirm correct code entry.
Disable gates:
Press Start to pause game play, then hold L and press Up, Left, Down,
Right, Left, Triangle, Square, X, Circle, Square.
Increased assist stocks:
Press Start to pause game play, then hold L and press Up(2), Down(2),
Up, Right, Down, Left, X(2).
Increased total health:
Press Start to pause game play, then hold L and press Up(2), Down(2),
X, Circle, Triangle, Square, X(2).
One more weapon widget:
Press Start to pause game play, then hold L and press Right, Up, Down,
Up, Triangle, Up, Left, Square, Triangle, Right.
Extra violent kills:
Press Start to pause game play, then hold L and press Circle, Left, X,
Up, Square, Right, Triangle, Down, X, Up.
Big head mode:
Press Start to pause game play, then hold L and press Triangle, Circle,
X, Square, Triangle, Up, Right, Down, Left, Up.
Big scythe mode:
Press Start to pause game play, then hold L and press Triangle, Square,
X, Circle, Triangle, Up, Left, Down, Right, Up.
Crazy Scythe trails:
Press Start to pause game play, then hold L and press Triangle, Up,
Circle, Right, X, Down, Square, Left, Triangle, Up.
Random color Scythe trails:
Press Start to pause game play, then hold L and press Down, X, Down,
X, Down, X, Down, X, Down, X.
Seep freed movie:
Press Start to pause game play, then hold L and press Left(2), Right(2),
Left, Right, Left, Right, X(2).